KMS Chongqing Institute of Green and Intelligent Technology, CAS
| Facile and rapid synthesis of emission color-tunable molybdenum oxide quantum dots as a versatile probe for fluorescence imaging and environmental monitoring | |
Cao, Haiyan1,2 ; Tang, Mingjie3 ; Wang, Xin4; Shi, Wenbing1,2
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| 2020-10-07 | |
| 摘要 | Recent years have seen molybdenum oxide quantum dots (MoO(x)QDs) as a booming material due to their attractive physical and chemical properties. However, there is still a large demand for MoO(x)QDs with long-wavelength emission by a facile strategy but these are more challenging to obtain. Herein, we rationally designed and successfully prepared nitrogen and phosphorus co-doped green emitting MoO(x)QDs (N,P-MoO(x)QDs) through a microwave-assisted rapid method. They exhibit a maximum emission at 500 nm under a 430 nm excitation. Moreover, by controlling their sizes in the process, we find that such a strategy enables the tuning of the emission color of N,P-MoO(x)QDs from green to blue. N,P-MoO(x)QDs show a significant fluorescence response to pH changes, and also display pH-sensitive near-infrared localized surface plasmon resonance (LSPR) at 866 nm. An effective and simple pH probe with a dual-signal response is achieved using N,P-MoO(x)QDs. As environmental sensors, N,P-MoO(x)QDs can be applied for sensitive detection of the concentrations of permanganate and captopril, offering the linear range from 0.08 to 25 mu M and 0.1 to 31 mu M, respectively. Benefitting from the effect of doping nitrogen and phosphorus, the probe could detect a wide range of pH changes (2-9) and is endowed with superior biocompatibility. Further, it is successfully used to "see" the intracellular pH variation by fluorescence confocal imaging. These findings not only demonstrate the achievement of a promising multifunctional probe for biosensing and environmental detection, but also pave the way for the fabrication of transition metal oxide QDs with tunable optical properties. |
| DOI | 10.1039/d0an01510e |
| 发表期刊 | ANALYST
 |
| ISSN | 0003-2654 |
| 卷号 | 145期号:19页码:6270-6276 |
| 通讯作者 | Cao, Haiyan(caohaiyan@yznu.edu.cn) |
| 收录类别 | SCI |
| WOS记录号 | WOS:000573175200007 |
| 语种 | 英语 |
